Characterization of microbial populations and volatile fatty acid concentrations in the jejunum, ileum, and cecum of pigs weaned at 17 vs 24 days of age

2002 ◽  
Vol 80 (11) ◽  
pp. 2904-2910 ◽  
Author(s):  
M. A. Franklin ◽  
A. G. Mathew ◽  
J. R. Vickers ◽  
R. A. Clift
Keyword(s):  
Fatty Acid ◽  
Volatile Fatty Acid ◽  
Microbial Populations

Characterization of biomass from a sulfidogenic, volatile fatty acid-degrading granular sludge reactor

1997 ◽  
Vol 20 (3) ◽  
pp. 229-236 ◽  
Author(s):  
F. Omil ◽  
P. Lens ◽  
L.W.Hulshoff Pol ◽  
G. Lettinga
Keyword(s):  
Fatty Acid ◽  
Volatile Fatty Acid ◽  
Granular Sludge

scholarly journals Methane formation in faunated and ciliate-free cattle and its relationship with rumen volatile fatty acid proportions

1984 ◽  
Vol 52 (2) ◽  
pp. 261-275 ◽  
Author(s):  
F. G. Whitelaw ◽  
J. Margaret Eadie ◽  
L. A. Bruce ◽  
W. J. Shand
Keyword(s):  
Fatty Acid ◽  
Volatile Fatty Acid ◽  
Rumen Fluid ◽  
Live Weight ◽  
Microbial Populations ◽  
Methane Formation ◽  
Residual Standard Deviation ◽  
Linear Relationships ◽  
Good Agreement ◽  
Ciliate Protozoa

1. Twelve steers fitted with rumen cannulas were used in three separate experiments to investigate the effects of the presence or absence of rumen ciliate protozoa on methane production. The diet consisted of 850 g barley and 150 g protein supplement/kg, and was given in three feeds daily at a restricted level of 61 g/kg live weight0.75. Animals were defaunated initially by allowingad lib. consumption of this diet and were then maintained ciliate-free by isolation or were faunated by inoculation with a mixed ciliate suspension. Samples of rumen fluid were taken routinely for the assessment of microbial populations and for volatile fatty acid (VFA) analysis and energy and nitrogen balances and digestibility measurements were made at intervals while animals were confined in respiration chambers.2. In each experiment the rumen VFA proportions changed from a high-propionate pattern under ciliate-free conditions to a low-propionate, high-butyrate pattern in the presence of ciliates: differences between treatments were highly significant (P < 0.001). There were also marked differences between treatments in CH, production but a reliable comparison was possible only in Expt 3, in which CH4was significantly higher (P < 0.001) in the presence of a rumen ciliate population. In Expt 3 the increased loss of energy as CH4in the faunated animals amounted to 44 MJ/100 MJ energy intake.3. Stoichiometric estimates of CH4production derived from the observed VFA proportions showed good agreement with CH4production as measured in respiration chambers. On average, the stoichiometric CH4values overestimated CH4production by a factor of 1.08.4. Highly significant linear relationships (P < 0.001) were observed between the molar proportion of each major VFA and the quantity of CH4produced: the proportion of propionic acid was inversely related to CH4and showed the lowest residual standard deviation of all the relationships examined.5. The losses of energy in faeces and urine did not differ between treatments hence the increased loss of energy as CH4in the faunated animals resulted in a significant reduction in the metabolizability of the diet from 0.73 to 0.69 (P < 0.05). No significant differences were detected between treatments in heat production, apparent digestibility coefficients or N balance.6. It is suggested that the rumen ciliates, by modifying the rumen VFA proportions, are directly responsible for the increased CH4production in faunated animals.

scholarly journals Characterization of Flavobacterium Species by Analysis of Volatile Fatty Acid Production

Microbiology ◽  
1986 ◽  
Vol 132 (10) ◽  
pp. 2723-2732
Author(s):  
D. RASOAMANANJARA ◽  
F. PELADAN ◽  
J. C. TURLOT ◽  
H. MONTEIL ◽  
C. RICHARD
Keyword(s):  
Fatty Acid ◽  
Acid Production ◽  
Volatile Fatty Acid ◽  
Fatty Acid Production
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